Rocks with holes made by Piddocks 12 – Common Piddock (Pholas dactylus) in situ in its shale rock burrow; view of anterior (front) end, ventral surface uppermost; showing sharp rasping spines on the beaked valves around the pedal gape; also showing paired protoplax accessory plates dorsally. Washed ashore at Monmouth Beach in Lyme Regis, Dorset, England.
Jessica's Nature Blog 